US2021339109A1PendingUtilityA1
Protective Net for Sports, and Protective Net for Golf, Protective Net for Soccer, Protective Net for Baseball, Protective Net for Tennis, and Protective Net for Volleyball Using the Same
Est. expiryDec 19, 2038(~12.4 yrs left)· nominal 20-yr term from priority
Inventors:Sang Hwan Kim
D04C 1/08A63B 2209/00D10B 2331/021A63B 71/022D03D 9/00D10B 2507/02D03D 13/00D03D 1/0035A63B 2102/32
54
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Claims
Abstract
The present invention forms meshes between intersections of synthetic fiber cords while the synthetic fiber cords having a form in which a plurality of synthetic fiber filaments are plied and twisted is crossed in a knotless type, wherein a diameter (d) of the synthetic fiber cord satisfies the Equation (I), a maximum distance (DI) between the intersections adjacent to each other satisfies the Equation (II), and a minimum distance (D2) between the intersections adjacent to each other satisfies the Equation (III). Since the present invention is made lightweight with a lower areal density than a conventional protective net for sports and increases rate of hole size with a small diameter of the synthetic fiber cord constituting the protective net, the present invention improves resistance against wind during manufacture of a protective net structure, and has excellent mechanical properties and thus provides excellent resistance against impact applied when a ball flies and bumps. Consequently, the present invention minimizes damage and extends a replacement cycle. Further, the present invention improves visibility with the high rate of hole size, and also improves stability by effectively preventing penetration of the ball between the meshes. Further, the present invention is easily mounted in the protective net structure and provides excellent flame retardancy and weather resistance.
Claims
exact text as granted — not AI-modified1 . A protective net for sports characterized by forming meshes between intersections of synthetic fiber cords while the synthetic fiber cords having a form in which a plurality of synthetic fiber filaments are plied and twisted are crossed in a knotless type, wherein a diameter (d) of the synthetic fiber cord satisfies the following Equation (I), a maximum distance (D 1 ) between the intersections adjacent to each other satisfies the following Equation (II), and a minimum distance (D 2 ) between the intersections adjacent to each other satisfies the following Equation (III):
Diameter
(
d
)
of
synthetic
fiber
cord
=
N
×
m
×
sin
2
(
0
)
×
1
2
(
v
0
2
-
9.81
×
h
)
σ
×
ɛ
×
L
×
π
I
Maximum
distance
(
D
1
)
between
adjacent
intersections
=
π
R
2
(
1
+
ɛ
)
II
Maximum
distance
(
D
2
)
between
adjacent
intersections
=
π
R
2
(
1
+
ɛ
)
×
(
n
n
+
4
)
III
in the Equations (I), (II) and (III), the units of each of a diameter (d) of the synthetic fiber cord, a maximum distance (D 1 ) and a minimum distance (D 2 ) between the intersections adjacent to each other are mm, m is a mass of a ball, N is a constant of 14.14214, c is an strain of the synthetic fiber filament material, θ is ball hitting angle, σ is a stress of the synthetic fiber filament material, Vo is a maximum velocity of a hit ball, L is a total length of the net that receives impact by the hit ball, which is calculated by the following Equation (IV), h is a height of the net that receives impact by the hit ball, which is calculated by the following Equation (V), R is a radius of the ball to which hit is applied, and n is the number of twists applied to the synthetic fiber filament to prepare the synthetic fiber cord,
L= 12.007× N 2×√ N 1 (IV)
in the Equation (IV), N 2 is an integer of 12, 17 or 24 as the number of distances (D) between the intersections of the net that receives impact by the hit ball, and N 1 is an integer of 1,2 or 4 as the number of intersections of the synthetic fiber cords to which the impact is applied by the ball;
h
=
(
Vo
×
sin
0
)
2
2
×
9.81
(
V
)
in the Equation (V), Vo is an initial velocity of the hit ball, and θ is a ball hitting angle.
2 . The protective net for sports according to claim 1 , wherein the synthetic fiber filament is an aramid filament.
3 . The protective net for sports according to claim 1 , wherein the synthetic fiber cord includes an aramid filament.
4 . The protective net for sports according to claim 2 , wherein the aramid filament has an strain of 2% to 4% or less.
5 . The protective net for sports according to claim 1 , wherein a areal density of the protective net for sports is 1 g/m 2 to 100 g/m 2 or less.
6 . The protective net for sports according to claim 1 , wherein a resin containing an ultraviolet stabilizer is coated onto the synthetic fiber cord.
7 . The protective net for sports according to claim 1 , wherein a fabric having a narrow width is sewn to an end of the protective net for sports.
8 . The protective net for sports according to claim 1 , wherein a cutting strength of the protective net for sports is 114 daN or more.
9 . The protective net for sports according to claim 1 , wherein a rate of hole size of the protective net for sports is 90% or more by the following Equation (VI):
Rate
of
hole
size
=
(
A
B
)
×
100
(
VI
)
in the Equation (VI), A is an area of the mesh, and B is an area obtained by multiplying a value (l 1 ) adding a diameter (d) of the aramid cord to a transverse length (l 2 ) of the mesh, and a value (h 1 ) adding the diameter (d) of the aramid cord to a longitudinal length (h 2 ) of the mesh.
10 . The protective net for sports according to claim 1 , wherein an abrasion resistance is 20 minutes or more, the abrasion resistance being a time required to damage the protective net by allowing a golf ball rotating at 3,000 rpm to contact the same position of the protective net after mounting the protective net for sports to a rotational friction tester.
11 . The protective net for sports according to claim 1 , wherein the diameter (d) of the synthetic fiber cord is 0.85 mm to 1.5 mm, the maximum distance (D 1 ) of the intersections adjacent to each other is 35 mm or less, and the minimum distance (D 2 ) of the intersections adjacent to each other is 20 mm or more.
12 . The protective net for sports according to claim 1 , wherein the diameter (d) of the synthetic fiber cord is 0.59 mm to 0.84 mm, the maximum distance (D 1 ) of the intersections adjacent to each other is 140 mm or less, and the minimum distance (D 2 ) of the intersections adjacent to each other is 135 mm or more.
13 . The protective net for sports according to claim 1 , wherein the diameter (d) of the synthetic fiber cord is 0.75 mm to 1.07 mm, the maximum distance (D 1 ) of the intersections adjacent to each other is 50 mm or less, and the minimum distance (D 2 ) of the intersections adjacent to each other is 40 mm or more.
14 . The protective net for sports according to claim 1 , wherein the diameter (d) of the synthetic fiber cord is 0.73 mm to 1.03 mm, the maximum distance (D 1 ) of the intersections adjacent to each other is 42 mm or less, and the minimum distance (D 2 ) of the intersections adjacent to each other is 38 mm or more.
15 . The protective net for sports according to claim 1 , wherein the diameter (d) of the synthetic fiber cord is 0.33 mm to 0.47 mm, the maximum distance (D 1 ) of the intersections adjacent to each other is 126 mm or less, and the minimum distance (D 2 ) of the intersections adjacent to each other is 122 mm or more.
16 . A protective net for golf characterized by using the protective net for sports of claim 11 .
17 . A protective net for soccer characterized by using the protective net for sports of claim 12 .
18 . A protective net for baseball characterized by using the protective net for sports of claim 13 .
19 . A protective net for tennis characterized by using the protective net for sports of claim 14 .
20 . A protective net for volleyball characterized by using the protective net for sports of claim 15 .Join the waitlist — get patent alerts
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